JP6719056B2 - Image blur correction device and imaging device - Google Patents

Description

The present disclosure relates to an image blur correction device including an image pickup device, and an image pickup device.

2. Description of the Related Art Conventionally, an imaging device having a mechanism for correcting shake of an optical image during image pickup (hereinafter, referred to as “image shake correction mechanism”) has been widely used for the purpose of obtaining a clear picked-up image.

Such image blur correction mechanism includes an optical image blur correction mechanism and an image sensor drive type image blur correction mechanism. The optical image blur correction mechanism corrects or drives a part or all of the optical lens in a plane perpendicular to the optical axis or in a tilt direction with respect to the optical axis (for example, see Patent Document 1). The image sensor driving type image blur correction mechanism corrects and drives the image sensor in a plane perpendicular to the optical axis (for example, see Patent Document 2).

JP, 2013-83753, A JP 2012-48215 A

The present disclosure provides an image blur correction device that is effective in stably performing image blur correction.

An image shake correction apparatus according to the present disclosure is an image shake correction apparatus that corrects shake of a subject image to be captured, and includes a movable frame, a fixed frame, a plurality of connecting members, a plurality of actuators, and a pair of magnets. And a magnetic body. The movable frame is displaceable along a plane orthogonal to the optical axis. The fixed frame faces the movable frame. The plurality of connecting members connect the fixed frame and the movable frame and support the movable frame in a displaceable manner. The plurality of actuators change the position of the movable frame according to the displacement of the movable frame. The pair of magnets is provided on one of the fixed frame and the movable frame and has a first magnetic pole and a second magnetic pole. The magnetic body is provided on the other of the fixed frame and the movable frame, and is arranged so as to face the pair of magnets. The magnetic body further has a flat surface facing the pair of magnets, and the flat surface has four sides. The first side of the four sides is disposed between the first magnetic pole and the second magnetic pole of the pair of magnets, and the second side intersecting the first side is one of the first magnetic pole and the second magnetic pole of the pair of magnets. Are arranged along. The first side has a linear shape, and the second side has a concave shape or a convex shape that intersects with the first side.

The image blur correction device according to the present disclosure is effective for stably performing image blur correction.

1 is a perspective view of a digital camera according to Embodiment 1 of the present disclosure. FIG. 2 is a front view of the digital camera according to Embodiment 1 of the present disclosure. FIG. 3 is a front view of the image shake correction apparatus according to the first embodiment of the present disclosure. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a graph showing the relationship between the moving amount of the deformed suction plate and the returning force amount to the center position of the image shake correcting apparatus according to the first embodiment of the present disclosure. FIG. 7 is a graph showing the relationship between the amount of movement of the deformed suction plate and the rate of change in the amount of returning force to the center position of the image shake correction apparatus according to Embodiment 1 of the present disclosure. FIG. 8A is a diagram showing a state where the deformed attraction plate is displaced to one side with respect to the sensor magnet in the image blur correction device according to the first embodiment of the present disclosure. FIG. 8B is a diagram showing a state in which the deformed attraction plate is located at the center position with respect to the sensor magnet in the image shake correction apparatus according to the first embodiment of the present disclosure. FIG. 8C is a diagram showing a state where the deformed attraction plate is displaced to the other side with respect to the sensor magnet in the image blur correction device according to the first embodiment of the present disclosure. FIG. 9A is a diagram showing a state in which the deformed attraction plate according to the modified example of the first embodiment of the present disclosure is displaced to one side with respect to the sensor magnet. FIG. 9B is a diagram showing a state in which the deformed attraction plate according to the modified example of the first embodiment of the present disclosure is located at the center position with respect to the sensor magnet. FIG. 9C is a diagram showing a state in which the deformed attraction plate according to the modified example of the first embodiment of the present disclosure is displaced to the other side with respect to the sensor magnet. FIG. 10A is a diagram showing a modified suction plate according to another embodiment of the present disclosure. FIG. 10B is a diagram showing another variant suction plate according to another embodiment of the present disclosure. FIG. 10C is a diagram showing yet another modified suction plate according to another embodiment of the present disclosure.

(Overview)
An image pickup apparatus (for example, a camera body) equipped with an image pickup element drive type image shake correction mechanism has an image pickup element which is attached to a movable frame and is two-dimensionally displaceable in a plane orthogonal to the optical axis together with the movable frame. The image pickup device calculates an in-plane displacement direction and displacement amount of an image pickup element from an output of an angular velocity sensor provided in the image pickup device main body, and an object of a photographing lens that forms an image on the image pickup element based on the calculated displacement amount. Correct image shake.

Here, the amount of displacement of the image pickup device is the amount of movement within the same plane from the reference position (the position when the image pickup device is not displaced) in the plane orthogonal to the optical axis.

A drive device (actuator) for an image sensor includes a fixed frame and a movable frame. The movable frame is held by a rolling bearing composed of at least three ball members. Therefore, a force (attracting force) for urging the movable frame against the fixed frame via the ball member is required. Mechanisms for forming this attractive force include urging by a tension spring or magnetic attraction.

In the urging by the tension spring, the spring force becomes stronger according to the displacement amount of the image pickup element, and not only the urging force of the movable frame in the fixed frame direction but also the urging force in the direction against the displacement direction becomes large. Further, since the tension spring cannot avoid static contact between the movable frame and the fixed frame, the friction due to the displacement of the movable frame has a great influence on the drive control. On the other hand, when magnetic attraction is used, contrary to the spring bias, the attracting force becomes weaker according to the amount of displacement of the image sensor, and a force similar to that of the spring is generated in the displacement direction. Therefore, in either method, there is a problem that actuator control becomes very complicated.

In the image blur correction device according to the first embodiment described below, the image pickup device that is two-dimensionally driven in the plane orthogonal to the optical axis of the photographing lens is sucked stably in the optical axis direction. Optimize the shape of the suction plate for the magnet.

Hereinafter, Embodiment 1 of the present disclosure will be described with reference to the drawings. In the description of the drawings referred to below, the same or similar parts are denoted by the same or similar reference numerals. However, the drawings are schematic, and the ratios of the respective dimensions may differ from the actual ones. Therefore, specific dimensions should be determined in consideration of the following description. Further, it is needless to say that the drawings include portions in which dimensional relationships and ratios are different from each other.

In addition, in the following embodiments, a digital camera will be described as an example of the “imaging device”. In the following description, “front”, “rear”, “top”, “bottom”, “right”, and “left” are terms based on an image pickup apparatus in a horizontal shooting posture facing the subject, and the subject side is “front”, The opposite side of the subject, that is, the side of the photographer is referred to as “rear”.

(Embodiment 1)
[1-1. Constitution]
[1-1-1. Schematic configuration of imaging device]
A schematic configuration of the digital camera 100 according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a digital camera 100 according to the first embodiment of the present disclosure. FIG. 2 is a front view of the digital camera 100 according to the first embodiment of the present disclosure.

As shown in FIGS. 1 and 2, the digital camera 100 includes a camera body 101 and a lens unit 200.

The camera body 101 (an example of an imaging device) includes a housing 10, a body mount 20, a shutter button 30, a hot shoe 40, a flash light emitting unit 50, an electronic viewfinder 60, and a display device 70. The housing 10 houses the image blur correction device 1 (see FIG. 3) and the like. The housing 10 has a front surface S1, an upper surface S2, a rear surface S3, and a lower surface S4. The body mount 20 is provided on the front surface S1 of the housing 10. The lens unit 200 can be attached to the body mount 20 by bayonet coupling or the like. The body mount 20 has an opening 20a centered on the optical axis AX of the lens unit 200. Incident light from the lens unit 200 is guided into the housing 10 through the opening 20a. The shutter button 30 is provided on the upper surface S2 of the housing 10. The shutter button 30 receives a shutter opening/closing operation by the user.

The hot shoe 40 is provided on the upper surface S2 of the housing 10. A general-purpose external component (for example, a flash light emitting device) can be attached to the hot shoe 40. The flash light emitting unit 50 is provided on the upper surface S2 of the housing 10. The flash light emitting unit 50 can be housed in the housing 10. Note that FIGS. 1 and 2 show a state in which the flash light emitting unit 50 is pulled out from the housing 10. The electronic viewfinder 60 is provided on the rear surface S3 of the housing 10. The electronic viewfinder 60 displays an image in the shooting range. The photographer can observe the image displayed on the electronic viewfinder 60. The display device 70 is provided on the rear surface S3 of the housing 10. The display device 70 displays an image of the shooting range, an operation menu, and the like. As the display device 70, for example, a liquid crystal display, an organic EL (Electro-Luminescence) display, an inorganic EL display, or the like can be used.

Further, the digital camera 100 internally has a shutter unit (not shown), an image blur correction device 1 (FIG. 3), an image sensor 12 (FIG. 4), a circuit board 13 (FIG. 4), and a control circuit board (not shown). ) Etc. The image sensor 12 is composed of, for example, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, a CCD (Charge-Coupled Device) image sensor, or the like.

The digital camera 100 shown in FIG. 1 is an example, and the form is not limited to this. For example, instead of the interchangeable lens type camera, a lens integrated type camera or a single lens reflex camera may be used.

A lens unit 200 (an example of an image pickup apparatus) shown in FIG. 1 is an interchangeable lens unit, which is a lens mount 201 mounted on a body mount 20 of a camera body 101, and a focus ring 202 which is an operation unit for driving a focus lens. It has a zoom ring 203 which is an operation unit for driving the zoom lens. Although not shown, the lens unit 200 further includes an optical system including a lens controller, a focus lens and a zoom lens, a focus lens drive unit, a zoom lens drive unit, a zoom ring, a diaphragm, an aperture drive unit, and a DRAM (Dynamic). Random Access Memory), flash memory, and the like.

The light from the subject enters the camera body 101 via the optical system inside the lens unit 200, and is received by the light receiving surface of the image sensor 12. The optical image received by the image sensor 12 is converted into an electric signal, that is, image data. The image data is subjected to predetermined processing (for example, AD (Analog/Digital) conversion) by the circuit board 13 that executes a predetermined program, and is further displayed on the display device 70 by a control circuit board (not shown).

[1-1-2. Schematic configuration of image blur correction device]
A schematic configuration of the image blur correction device 1 according to the first embodiment will be described with reference to the drawings.

FIG. 3 is a front view of the image blur correction device 1 according to the first embodiment of the present disclosure. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG.

The image blur correction device 1 according to the first embodiment will be described with reference to FIGS. 3, 4, and 5. The image blur correction device 1 includes a drive mechanism that drives the image sensor 12.

As shown in FIGS. 3 and 4, the image blur correction device 1 mainly includes a movable frame 11, a circuit board 13, ball holders 110a, 110b and 110c, drive coils 15, 16 and 17, drive magnets 25a and 25b. , 26b, 27a and 27b, magnetic displacement detection sensors 14a, 14b and 14c, sensor magnets 22a and 22b, 23a and 23b, 24a and 24b, a variant suction plate 19, and a fixed holding member 21. The circuit board 13, ball holders 110 a, 110 b, 110 c, drive coils 15, 16, 17, magnetic displacement detection sensors 14 a, 14 b, 14 c, and variant suction plate 19 are attached to the movable frame 11. The drive magnets 25a and 25b, 26b, 27a and 27b, and the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b are attached to the fixed holding member 21.

The movable frame 11 (an example of a movable frame) holds the image pickup element 12 and is arranged to face the fixed holding member 21. The circuit board 13 is electrically connected to the image sensor 12 and converts an electric signal from the image sensor 12 from an analog signal to a digital signal. The movable frame 11 holds the image sensor 12 so as to be movable in a direction orthogonal to the optical axis AX. The ball holding portions 110a, 110b, 110c hold ball members 31a, 31b, 31c (an example of a connecting member) that connects the movable frame 11 and the fixed holding member 21. The ball members 31 a, 31 b, 31 c support the movable frame 11 so as to be displaceable with respect to the fixed holding member 21. Details of the ball holding portions 110a, 110b, 110c will be described later.

The three drive coils 15, 16 and 17 are adhesively fixed to the movable frame 11. The terminals of each drive coil are soldered to the circuit board 13 electrically connected to the image sensor 12. The terminals of each drive coil are fed from the circuit board 13. Three drive coils 15, 16, 17, a pair of drive magnets 25a and 25b arranged to face the drive coil 15 in the optical axis direction, and a pair of drive magnets arranged to face the drive coil 16 in the optical axis direction. The drive magnets 26b and 27a, and the pair of drive magnets 27a and 27b arranged so as to face the drive coil 17 in the optical axis direction constitute an actuator (an example of an actuator) that drives the image sensor 12. In the present embodiment, the drive magnets 25a and 27a are magnetized to the S pole on the side facing the drive coils 15, 16 and 17, and the drive magnets 25b, 26b and 27b are driven by the drive coils 15, 16 and 17. Is magnetized to the N pole on the side opposite to.

The three magnetic displacement detection sensors 14 a, 14 b, 14 c (an example of a displacement detection unit) are arranged on the circuit board 13. The magnetic displacement detection sensors 14a, 14b, 14c are composed of, for example, Hall elements. On the fixed holding member 21 facing the magnetic displacement detection sensors 14a, 14b, 14c, sensor magnets 22a and 22b, 23a and 23b, 24a and 24b respectively facing the magnetic displacement detection sensors 14a, 14b and 14c in the optical axis direction. (An example of a plurality of pairs of magnets) is provided. The magnetic displacement detection sensors 14a, 14b, 14c and the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b detect the displacement of the image sensor 12. The sensor magnets 22a, 23a, 24a are magnetized to the S pole (one example of the first magnetic pole and the second magnetic pole) on the side facing the movable frame 11, and the sensor magnets 22b, 23b, 24b are attached to the movable frame 11. It is magnetized as an N pole (an example of the other of the first magnetic pole and the second magnetic pole) on the opposite side.

The deformed suction plate 19 (an example of a magnetic body) has a rectangular shape made of a magnetic body such as a metal plate, and is arranged so that its four sides are aligned with the X-axis direction and the Y-axis direction. Among the four sides of the deformed suction plate 19, a pair of opposing sides are concave arcs.

The deformed attraction plate 19 is arranged on the movable frame 11 facing the sensor magnets 22a and 22b (an example of a first pair of magnets) and 23a and 23b (an example of a second pair of magnets). The deformed attraction plate 19 uses the magnetic force of the sensor magnets 22a, 22b, 23a, 23b to attract the movable frame 11 to the fixed holding member 21 side. As a result, the ball members 31a, 31b, 31c held by the ball holding portions 110a, 110b, 110c, which will be described later, can be urged toward the fixed holding member 21 side.

The fixed holding member 21 (an example of a fixed frame) is fixed to a support frame (not shown) in the camera body 101.

The image sensor 12 driven by the drive mechanism is fixed to the movable frame 11 by adhesion or the like. The image sensor 12 is electrically connected to the circuit board 13.

[1-1-3. Ball holding part]
As shown in FIGS. 3 and 5, the movable frame 11 is provided with three rectangular ball holding portions 110a, 110b, 110c in plan view. Each of the ball holding portions 110a, 110b, 110c has a surface with which the ball members 31a, 31b, 31c abut (hereinafter referred to as a ball abutment surface), which is orthogonal to the optical axis AX. Movable metal plates 111a, 111b, and 111c having smooth surfaces and as little magnetism as possible are arranged on the respective ball contact surfaces. The ball members 31a, 31b, 31c are made of, for example, a highly rigid non-metallic material such as zirconia. Further, the fixed holding member 21 has a surface that is substantially orthogonal to the optical axis AX at a position facing the ball members 31a, 31b, 31c, and has a smooth surface. Fixed metal plates 28a, 28b, 28c which are as magnetic as possible are fixed to the fixed holding member 21 by adhesion or the like.

[1-1-4. Actuator]
The actuator is composed of drive coils 15, 16, 17 and drive magnets 25a and 25b, 27a and 26b, 27a and 27b, which will be described below. The actuator can correct the image blur caused by the movement of the camera body 101 by changing the position of the movable frame 11.

The three pairs of drive magnets 25a and 25b, 27a and 26b, 27a and 27b are arranged on the fixed holding member 21 arranged on the rear surface side of the image sensor 12 so as to face the respective drive coils 15, 16 and 17. Has been done. Each drive coil 15, 16 and 17 moves from the central position with respect to the corresponding pair of the three pairs of drive magnets 25a and 25b, 27a and 26b, 27a and 27b, depending on the feeding direction from the circuit board 13. Will be done. The drive coils are provided in three places for the purpose of rotationally driving around the illustrated Z axis in the plane orthogonal to the optical axis AX. Specifically, the drive coil 15 is supplied with electric power for driving in the X+ direction (the arrow direction of X) shown in FIG. 3, and the drive coil 16 is supplied with electric power for driving in the X- direction. At this time, rotation about the Z axis occurs, but the center of rotation is not fixed. Therefore, the center of rotation can be determined according to the amount and direction of power supply to the drive coil 17. Further, when the rotational drive around the Z axis is not necessary, the drive coil 15 and the drive coil 16 are driven in the yaw direction by supplying the power in the same phase, and the power is supplied to the drive coil 17 in the pitch direction. Can be driven to. However, it is difficult to make the center of gravity of the movable frame 11 itself coincide with the center of gravity of the driving force. Driving in the direction, the pitch direction, and the roll direction is executed.

[1-1-5. Displacement detection mechanism]
The displacement detection mechanism is composed of magnetic displacement detection sensors 14a, 14b, 14c and sensor magnets 22a and 22b, 23a and 23b, 24a and 24b, which will be described below.

Magnetic displacement detection sensors 14a, 14b, and 14c are arranged at three positions on the rear surface side (the side opposite to the subject) of the image pickup element 12 of the circuit board 13. Each of them detects a displacement of at least one of the image sensor 12 in the yaw direction and the pitch direction. Another magnetic displacement detection sensor is arranged in either the yaw direction or the pitch direction. In this embodiment, two magnetic displacement detection sensors 14a and 14b are arranged for yaw direction detection, and one magnetic displacement detection sensor 14c is arranged for pitch direction detection. At this time, the midpoint C of the line connecting the two magnetic displacement detection sensors 14a and 14b for detecting the yaw direction is approximately set to the center position of the image sensor 12 in forming a magnetic attraction mechanism described later. Further, the fixed holding member 21 has a pair of sensor magnets 22a and 22b, a pair of sensor magnets 23a and 23b, and a pair of sensor magnets 24a and 24b at positions corresponding to the magnetic displacement detection sensors 14a, 14b and 14c, respectively. It is arranged. The three pairs of sensor magnets 22a and 22b, 23a and 23b, and 24a and 24b are fixed to the sensor magnet yoke plate 29 fixed to the fixed holding member 21 by adhesion or the like as shown in FIG.

In the present embodiment, the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b are arranged in the hole 21c provided in the fixed holding member 21. This is to secure a space for a magnetic attraction mechanism described later, and if the space is sufficient, the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b may be directly fixed to the fixed holding member 21.

The displacement detection mechanism described above can accurately detect at least the displacement of the image sensor 12 in the yaw direction, the pitch direction, and the roll direction.

[1-1-6. Magnetic attraction mechanism]
The magnetic attraction mechanism includes a variant attraction plate 19 and sensor magnets 22a and 22b, 23a and 23b, which will be described below.

In the ball holding portions 110a, 110b, 110c, unless the image pickup device 12 is constantly pressed toward the fixed holding member 21, the ball members 31a, 31b, 31c may fall off and smooth driving due to rolling may not be possible. .. Therefore, in the present embodiment, the magnetic attraction to the side opposed to the magnetic displacement detection sensors 14a, 14b, 14c by the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b is utilized, and the deformed suction plate 19 and the sensor. An attractive force is applied between the magnets 22a and 22b and 23a and 23b. As a result, the problem due to the conventional tension spring can be solved, a space for arranging the spring is not required, and it is possible to realize a downsized image blur correction device having high control performance.

Specifically, the variant suction plate 19 is fixed to the holding member 18 attached to the movable frame 11 by adhesion or the like. The deformed attraction plate 19 is held by the sensor magnets 22a, 22b, 23a, and 23b in a state where the deformed attraction plate 19 is held at the center position in the movable range of the image sensor 12 and in the plane where the center of the deformed suction plate 19 is orthogonal to the optical axis AX. It is arranged so as to coincide with the center C of the enclosed gap and the four sides of the variant suction plate 19 coincide with the yaw direction and the pitch direction. Further, the image pickup device 12, the circuit board 13, the magnetic displacement detection sensors 14a, 14b, 14c, the holding member 18, the variant suction plate 19, the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b are arranged in the optical axis AX direction. They are arranged in order. These members are fixed to the movable frame 11 by screw fastening or the like. With this configuration, it is possible to perform suction by the variant suction plate 19 at the substantial center of the image sensor 12, that is, near the optical axis AX. Therefore, a stable suction force can be maintained even when the image sensor 12 is displaced.

[1-1-7. Movement restriction mechanism]
The movement restricting mechanism is composed of restricting shafts 112 and 113 and restricting holes 21a and 21b described below.

As described above with respect to the ball holding portions 110a, 110b, 110c, the image pickup device 12 is displaced, and the ball members 31a, 31b, 31c are rectangular standing walls 119 (FIG. 5) of the ball holding portions 110a, 110b, 110c. When it comes into contact with, the friction load exceeding the rolling load is generated. The standing wall 119 is a surface that is substantially parallel to the optical axis AX that surrounds the ball members 31a, 31b, and 31c among the surfaces that form the ball holding portions 110a, 110b, and 110c. Since this frictional load is a variable factor in the driving force of the actuator, accurate image blur correction control becomes difficult. Further, when an unexpected impact or the like is applied, there is a concern that the ball members 31a, 31b, 31c may fall over the standing wall 119 and fall off.

Therefore, as shown in FIGS. 3 and 5, the limiting shafts 112 and 113 supported by the holding member 18 are provided. The limiting shafts 112 and 113 are provided in limiting holes 21 a and 21 b provided in the fixed holding member 21. The limiting shafts 112, 113 are provided with buffer rings 112a, 113a so that no abnormal noise is generated when the limiting shafts 112, 113 contact the walls of the limiting holes 21a, 21b. The limiting shafts 112 and 113 contact the end faces of the limiting holes 21a and 21b via the buffer rings 112a and 113a.

[1-2. motion]
Hereinafter, the operation of the image blur correction device 1 according to the present embodiment will be described.

[1-2-1. Image blur correction operation]
When the camera body 101 moves and the optical axis of the light from the subject deviates from the center of the image sensor 12 during image capturing by the digital camera 100, the magnetic displacement detection sensors 14a, 14b, and 14c cause horizontal and vertical directions. The displacement direction and the displacement amount of the image sensor 12 in the yaw direction, the pitch direction, and the roll direction are detected. When the detected displacement direction and displacement amount are measured by the circuit board 13, the circuit board 13 supplies power to the drive coils 15, 16 and 17 according to the measurement result. At this time, the circuit board 13 supplies power to at least one of the drive coils 15, 16 and 17 according to the measured displacement amount and displacement direction. By this power supply, the magnetic force with respect to the corresponding drive magnets 25a and 25b, 27a and 26b, 27a and 27b changes, and the movable frame 11 moves. As a result, the image pickup device 12 fixed to the movable frame 11 is displaced in such a direction and amount as to correct the image blur.

[1-2-2. Operation of magnetic attraction mechanism]
During the above-described correction shake operation, the movable frame 11 is displaced with respect to the fixed holding member 21, so that the magnetic force of the suction plate with respect to the sensor magnet changes.

[1-2-2-1. Relationship between displacement due to suction plate shape and restoring force]
FIG. 6 is a graph showing the relationship between the amount of movement of the deformed suction plate 19 of the image shake correction apparatus 1 according to the first embodiment of the present disclosure and the amount of returning force to the center position.

The graph of FIG. 6 shows the relationship between the displacement amount (movement amount) of the suction plate and the restoring force in the direction orthogonal to the optical axis AX. In the present embodiment, the size of the suction plate is a rectangular suction plate having a size of 8 mm×7 mm (a quadrilateral with all corners being right angles), and the suction plate has a deformed suction plate in which both sides of 8 mm are recessed in an arc shape of 1.5 mm. 19 (FIG. 3) is shown.

As can be seen from FIG. 6, in the variant suction plate 19, the change in the restoring force with respect to the change in the movement amount is smaller than that in the rectangular suction plate. From this, in the image blur correction operation, even if the deformed attraction plate 19 fixed to the movable frame 11 is largely displaced with respect to the sensor magnets 22a and 22b and 23a and 23b attached to the fixed holding member 21, The change in the suction force due to the odd-shaped suction plate 19 is small. As a result, the attraction force of the magnetic attraction mechanism according to the present embodiment can be stably obtained, and the ball holding portions 110a, 110b, 110c can hold the ball members 31a, 31b, 31c more stably. Become. As a result, the image blur correction operation can be stably executed.

FIG. 7 is a graph showing the relationship between the amount of movement of the deformed suction plate and the rate of change in the amount of returning force to the center position of the image shake correction apparatus according to Embodiment 1 of the present disclosure.

The graph of FIG. 7 shows the relationship between the displacement amount (movement amount) of the suction plate and the rate of change of the restoring force. From this graph, it can be seen that the changing rate of the restoring force has a more linear change in the deformed shape. That is, it is understood that the voltage control calculation for the displacement amount is easier in the change control of the power supply.

The reason will be specifically described below.

[1-2-2-2. Effect of rectangular suction plate]
Hereinafter, with reference to FIGS. 8A to 8C, the operation of the magnetic attraction mechanism including the variant attraction plate 19 in the present embodiment will be described.

FIG. 8A is a diagram showing a state where the deformed attraction plate 19 is displaced to one side with respect to the sensor magnets 22a and 22b and 23a and 23b in the image shake correction apparatus 1 according to the first embodiment of the present disclosure. FIG. 8B is a diagram showing a state in which the odd-shaped attraction plate 19 is located at the center position with respect to the sensor magnets 22a and 22b and 23a and 23b in the image blur correction device 1. FIG. 8C is a diagram showing a state in which the deformed attraction plate 19 is displaced to the other side with respect to the sensor magnets 22a and 22b and 23a and 23b in the image blur correction device 1.

FIG. 8B shows the deformed suction plate 19 in the magnetic equilibrium position. As shown in FIG. 8B, the deformed suction plate 19 has a line-symmetrical shape and has a flat surface facing the sensor magnets 22a, 22b, 23a, and 23b. Of the four sides of the same plane, the straight side 19L1 (an example of the first side) is arranged across the S-pole sensor magnet 22a and the N-pole sensor magnet 22b. A straight side 19L3 (an example of a third side) that faces the side 19L1 is arranged between the S-pole sensor magnet 23a and the N-pole sensor magnet 23b. A concave side 19L2 (an example of a second side) that intersects the side 19L1 is arranged between the N-pole sensor magnet 22b and the N-pole sensor magnet 23b. A side 19L4 (an example of a fourth side) that faces the side 19L2 is arranged between the S-pole sensor magnet 22a and the S-pole sensor magnet 23a.

In the case where the suction plate has a rectangular shape, when the displacement amount of the suction plate becomes large, the suction force in the optical axis AX direction is rapidly attenuated and returned to the magnetic equilibrium position (the intermediate point C shown in FIG. 3 in this embodiment). The force in the direction orthogonal to the optical axis AX to be steeply increases. The attraction force is generated in proportion to the area of the attraction plate, but its displacement increases the leakage flux in the thickness direction of the attraction plate, increasing the attraction force to the magnet on one side and the leakage flux from the other magnet. It becomes smaller and the suction power decreases. As a result, a difference in suction force is generated according to the amount of displacement of the suction plate, and a restoring force in the direction orthogonal to the optical axis AX is produced. At this time, the power supply to the actuator has to be changed and controlled according to the displacement amount detection, but it becomes very difficult to perform the intended control with respect to a steep change in the restoring force.

FIG. 8A shows a case where the suction plate is displaced to the X+ side. When the attraction plate is a rectangular attraction plate, the end surface of the side VL2 on the X+ side is located near the end surfaces of the sensor magnets 22b and 23b. Therefore, the leakage magnetic flux MF1n acting on the end face of the side VL2 is smaller than the leakage magnetic flux MF1s acting on the end face of the side VL4 facing the side VL2. Therefore, due to the above difference in the suction force, a force that returns in the X-direction acts on the suction plate. On the other hand, in the case of the deformed suction plate 19, the end surface of the side 19L2 on the X+ side is located near the end surfaces of the sensor magnets 22b and 23b, but since it has a concave shape, it is smaller than that of the rectangular suction plate. , The leakage magnetic flux MF1n acting on the end face of the side 19L2 is large. As a result, the restoring force in the X-direction due to the suction difference is relatively small.

FIG. 8C shows a case where the suction plate is displaced to the X− side. When the attraction plate is a rectangular attraction plate, the end surface of the side VL4 on the X- side is located near the end surfaces of the sensor magnets 22a and 23a. Therefore, the leakage magnetic flux MF1s acting on the end face of the side VL4 is smaller than the leakage magnetic flux MF1n acting on the end face of the side VL2 facing the VL4. Therefore, due to the difference in the above-mentioned suction force, a force for returning in the X+ direction acts on the suction plate. On the other hand, in the case of the deformed suction plate 19, the end surface of the side 19L4 on the X- side is located near the end surfaces of the sensor magnets 22a and 23a, but since it has a concave shape, it is smaller than that of the rectangular suction plate. Thus, the leakage magnetic flux MF1s acting on the end face of the side 19L3 is large. As a result, the restoring force in the X+ direction due to the suction difference is relatively small.

As described above, in the case of the deformed attraction plate 19, even if the displacement amount with respect to the sensor magnets 22a and 22b and 23a and 23b becomes large, the attraction force in the optical axis AX direction is attenuated, which is equivalent to the rectangular attraction plate. However, there is a feature that the change in force in the direction orthogonal to the optical axis AX for returning to the magnetic equilibrium position is small. In the case of the variant suction plate 19, the attraction force is generated in proportion to the area of the variant suction plate 19, so that the displacement of the variant suction plate 19 increases the leakage magnetic flux in the thickness direction of the variant suction plate 19 to cause the magnet on one side to move. The suction power to is increased. However, the degree to which the leakage magnetic flux due to the magnet on the other side becomes smaller is smaller than that of the rectangular suction plate, so that the difference in the suction force according to the displacement amount of the odd-shaped suction plate 19 becomes small. Therefore, when the deformed suction plate 19 is displaced, the restoring force in the direction orthogonal to the optical axis AX becomes smaller than that of the rectangular suction plate.

As a result, the fluctuation of the restoring force of the odd-shaped suction plate 19 is moderated, so that the change control of the power supply to the actuator according to the displacement amount detection becomes easy.

[1-3. Modification]
FIG. 9A is a diagram illustrating a state in which variant suction plate 219 according to the modified example of Embodiment 1 of the present disclosure is displaced to one side with respect to sensor magnets 22a, 22b, 23a, and 23b. FIG. 9B is a diagram showing a state in which the odd-shaped attraction plate 219 is in the central position with respect to the sensor magnets 22a, 22b, 23a, 23b. FIG. 9C is a diagram showing a state where the odd-shaped attraction plate 219 is displaced to the other side with respect to the sensor magnets 22a, 22b, 23a, 23b.

The shape of the variant suction plate 219 may be, for example, as shown in FIGS. 9A to 9C, a pair of opposing sides of the four sides of the suction plate may have a convex arc shape.

FIG. 9B shows a state in which the variant suction plate 219 according to the present modification is in the magnetic equilibrium position. As shown in FIG. 9B, the variant suction plate 219 has a flat surface facing the sensor magnets 22a, 22b, 23a, and 23b. Of the four sides of the same plane, the straight side 219L1 (an example of the first side) is arranged across the S-pole sensor magnet 22a and the N-pole sensor magnet 22b. A linear side 219L3 (an example of a third side) that faces the side 219L1 is arranged between the S-pole sensor magnet 23a and the N-pole sensor magnet 23b. A convex side 219L2 (an example of a second side) that intersects the side 219L1 is arranged between the N-pole sensor magnet 22b and the N-pole sensor magnet 23b. A side 219L4 (an example of a fourth side) opposite to the side 219L2 is arranged between the S-pole sensor magnet 22a and the N-pole sensor magnet 23a.

FIG. 9A shows a case where the suction plate according to this modification is displaced to the X+ side. When the attraction plate is a rectangular attraction plate, the end surface of the side 2VL2 on the X+ side is located near the end surfaces of the sensor magnets 22b and 23b. Therefore, the leakage magnetic flux MF1n acting on the end face of the side 2VL2 is smaller than the leakage magnetic flux MF1s acting on the end face of the side 2VL4 facing the side 2VL2. Therefore, due to the above difference in the suction force, a force that returns in the X-direction acts on the suction plate. On the other hand, in the case of the deformed suction plate 219, the end surface of the side 219L2 on the X+ side is located near the end surfaces of the sensor magnets 22b and 23b, but since it has a convex shape, it is more than in the case of the rectangular suction plate. , The leakage magnetic flux MF1n acting on the end face of the side 219L2 is large. As a result, the restoring force in the X-direction due to the suction difference is relatively small.

FIG. 9C shows a case where the suction plate is displaced to the X− side. When the attraction plate is a rectangular attraction plate, the end surface of the X-side side 2VL4 is located near the end surfaces of the sensor magnets 22a and 23a. Therefore, the leakage magnetic flux MF1s acting on the end surface of the side 2VL4 is smaller than the leakage magnetic flux MF1n acting on the end surface of the side 2VL2 facing the side 2VL4. Therefore, due to the difference in the above-mentioned suction force, a force for returning in the X+ direction acts on the suction plate. On the other hand, in the case of the deformed suction plate 219, the end surface of the side 219L4 on the X− side is located near the end surfaces of the sensor magnets 22a and 23a, but since it has a convex shape, it is smaller than the case of the rectangular suction plate. Thus, the leakage magnetic flux MF1s acting on the end face of the side 219L4 is large. As a result, the restoring force in the X+ direction due to the suction difference is relatively small.

As a result, the variation of the restoring force of the odd-shaped suction plate 219 becomes gentle, so that the change control of the power supply to the actuator according to the displacement amount detection becomes very easy.

[1-4. Features, etc.]
The image shake correction apparatus 1 according to the present embodiment is an image shake correction apparatus that corrects the shake of a subject image to be captured, and includes a fixed frame corresponding to the fixed holding member 21, a movable frame 11, and a plurality of ball members. A plurality of connecting members corresponding to 31a, 31b, 31c, a plurality of actuators corresponding to the drive coils 15, 16, 17 and drive magnets 25a and 25b, 27a and 26b, 27a and 27b, and sensor magnets 22a, 22b and 23a. , 23b, and a magnetic body corresponding to the variant suction plates 19, 219. The movable frame 11 is displaceable along a plane orthogonal to the optical axis. The fixed frame faces the movable frame 11. A plurality of connecting members corresponding to the ball members 31a, 31b, 31c connect the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and support the movable frame 11 in a displaceable manner. A plurality of actuators corresponding to the drive coils 15, 16, 17 and the drive magnets 25a and 25b, 27a and 26b, 27a and 27b change the position of the movable frame 11 according to the displacement of the movable frame 11. A pair of magnets corresponding to the sensor magnets 22a, 22b, 23a, and 23b are provided on one of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and correspond to the first magnetic pole corresponding to the S pole and the N pole. It has a second magnetic pole. A magnetic body corresponding to the variant suction plates 19, 219 is provided on the other side of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and faces a pair of magnets corresponding to the sensor magnets 22a, 22b, 23a, 23b. Is arranged as follows. The magnetic body corresponding to the variant suction plates 19 and 219 has a flat surface facing a pair of magnets corresponding to the sensor magnets 22a, 22b, 23a and 23b, and the flat surface has four sides. Of the four sides, the first sides 19L1 and 219L1 are arranged across the first magnetic pole corresponding to the S pole and the second magnetic pole corresponding to the N pole of the pair of magnets corresponding to the sensor magnets 22a and 22b. Second sides 19L2 and 219L2 intersecting 19L1 and 219L1 are arranged along one of the first magnetic pole corresponding to the S pole and the second magnetic pole corresponding to the N pole of the pair of magnets corresponding to the sensor magnets 22b and 23b. .. The first sides 19L1 and 219L1 are linear, and the second sides 19L2 and 219L2 are concave or convex so as to intersect the first sides 19L1 and 219L1.

In the image blur correction device 1, even if the displacement amount of the irregular suction plates 19, 219 with respect to the sensor magnets 22a and 22b, 23a and 23b becomes large as shown in, for example, FIG. 8A or 9A, the irregular suction plates 19, 219. By increasing the leakage magnetic flux in the thickness direction, the attraction force to the sensor magnet 22a or 23a on one side increases. However, the reduction of the leakage magnetic flux due to the sensor magnets 22b and 23b on the other side is suppressed. Therefore, the difference in the suction force according to the displacement amount of the odd-shaped suction plates 19, 219 is small. Therefore, even if the deformed suction plates 19 and 219 are displaced, the restoring force in the direction orthogonal to the optical axis AX for returning to the magnetic equilibrium position is small. As a result, the movable image sensor 12 in the image blur correction function can be stably attracted in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

Further, the image blur correction device 1 is a sensor magnet in which each of a pair of magnets corresponding to the sensor magnets 22a, 22b, 23a, 23b has a first magnetic pole corresponding to the S pole and a second magnetic pole corresponding to the N pole. A plurality of pairs of magnets corresponding to 22a, 22b, 23a, and 23b may be provided. Further, the other of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11 is provided so as to face a plurality of pairs of magnets corresponding to the sensor magnets 22a, 22b, 23a, 23b, and the sensor magnets 22a, 22b, 23a. , 23b may be provided with a plurality of displacement detection units corresponding to the magnetic displacement detection sensors 14a, 14b, 14c for detecting the displacement of the movable frame 11 by the change in magnetic flux of a plurality of pairs of magnets. Thereby, even when the image pickup device 12 is displaced, it is possible to maintain a stable suction force by the magnetic body corresponding to the odd-shaped suction plates 19, 219.

Further, the movable frame 11, the displacement detection units corresponding to the magnetic displacement detection sensors 14a, 14b, 14c, the magnetic bodies corresponding to the variant suction plates 19, 219, and the sensor magnets 22a and 22b, 23a and 23b, 24a and 24b. The pair of magnets may be arranged in this order along the optical axis direction. Thereby, even when the image pickup device 12 is displaced, it is possible to maintain a stable suction force by the magnetic body corresponding to the odd-shaped suction plates 19, 219.

Further, the magnetic body corresponding to the deformed attraction plates 19 and 219 is attracted to the pair of magnets corresponding to the sensor magnets 22a, 22b, 23a and 23b, so that the movable frame 11 corresponds to the ball members 31a, 31b and 31c. It may be arranged so as to be pressed against the connecting member. Accordingly, the connecting members corresponding to the ball members 31a, 31b, 31c can be urged to one side of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11.

Further, the magnetic body corresponding to the deformed attraction plates 19 and 219 is such that the third sides 19L3 and 219L3 of the four sides facing the first sides 19L1 and 219L1 are the S poles of a pair of magnets corresponding to the sensor magnets 23a and 23b. The fourth side 19L4, 219L4, which is disposed across the corresponding first magnetic pole and the second magnetic pole corresponding to the N pole and faces the second side 19L2, 219L2, corresponds to the sensor magnets 22a, 22b, 23a, 23b. Are arranged along the other of the first magnetic pole corresponding to the S pole and the second magnetic pole corresponding to the S pole of the pair of magnets, the third sides 19L3 and 219L3 are linear, and the fourth sides 19L4 and 219L4 are It may be a concave shape or a convex shape that intersects with the three sides 19L3 and 219L3. As a result, the movable image pickup device 12 in the image blur correction function can be stably attracted in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

Further, the displacement detection units corresponding to the magnetic displacement detection sensors 14a, 14b, 14c detect the displacement amount and displacement direction of the movable frame 11, drive coils 15, 16, 17 and drive magnets 25a and 25b, 27a and 26b, The actuators corresponding to 27a and 27b may change the position of the movable frame 11 according to the detected displacement amount and displacement direction of the movable frame 11. This makes it possible to correct the image blur caused by the movement of the camera body 101.

Further, the planar shape of the magnetic body corresponding to the variant suction plates 19, 219 may be line-symmetric. As a result, the movable image pickup device 12 in the image blur correction function can be stably attracted in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

The image blur correction apparatus 1 according to the present embodiment is an image blur correction apparatus that corrects the blur of a subject image to be captured, and includes a fixed frame corresponding to the fixed holding member 21, a movable frame 11, and a plurality of movable frames 11. A plurality of connecting members corresponding to the ball members 31a, 31b, 31c, a plurality of actuators corresponding to the drive coils 15, 16, 17 and the drive magnets 25a and 25b, 27a and 26b, 27a and 27b, and the sensor magnets 22a and 22b. , 23a, 23b, and a magnetic body corresponding to the variant suction plates 19, 219. The movable frame 11 is displaceable along a plane orthogonal to the optical axis. The fixed frame faces the movable frame 11. A plurality of connecting members corresponding to the ball members 31a, 31b, 31c connect the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and support the movable frame 11 in a displaceable manner. A plurality of actuators corresponding to the drive coils 15, 16, 17 and the drive magnets 25a and 25b, 27a and 26b, 27a and 27b change the position of the movable frame 11 according to the displacement of the movable frame 11. A pair of magnets corresponding to the sensor magnets 22a, 22b, 23a, and 23b are provided on one of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and correspond to the first magnetic pole corresponding to the S pole and the N pole. It has a second magnetic pole. A magnetic body corresponding to the variant suction plates 19, 219 is provided on the other side of the fixed frame corresponding to the fixed holding member 21 and the movable frame 11, and faces a pair of magnets corresponding to the sensor magnets 22a, 22b, 23a, 23b. Is arranged as follows. The pair of magnets corresponding to the sensor magnets 22a, 22b, 23a and 23b includes a first pair of magnets corresponding to the sensor magnets 22a and 22b and a second pair of magnets corresponding to the sensor magnets 23a and 23b. The magnetic body corresponding to the deformed attraction plates 19 and 219 has a flat surface facing the first pair of magnets corresponding to the sensor magnets 22a and 22b and the second pair of magnets corresponding to the sensor magnets 23a and 23b. It has four sides. Of the four sides, the first sides 19L1 and 219L1 are arranged between the first magnetic pole corresponding to the S pole and the second magnetic pole corresponding to the N pole of the first pair of magnets corresponding to the sensor magnets 22a and 22b. .. The second sides 19L2 and 219L2 intersecting the first sides 19L1 and 219L1 are the first magnetic poles corresponding to the S poles of the first pair of magnets corresponding to the sensor magnets 22a and 22b and the second sides corresponding to the sensor magnets 23a and 23b. The magnets are arranged so as to straddle between the first magnetic poles corresponding to the S poles of the pair of magnets. The first sides 19L1 and 219L1 are linear, and the second sides 19L2 and 219L2 are concave or convex so as to intersect the first sides 19L1 and 219L1.

As a result, the movable image pickup device 12 in the image blur correction function can be stably attracted in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

Further, in the magnetic body corresponding to the deformed attraction plates 19 and 219, the third sides 19L3 and 219L3 of the four sides facing the first sides 19L1 and 219L1 are S of the second pair of magnets corresponding to the sensor magnets 23a and 23b. The first magnetic pole corresponding to the pole and the second magnetic pole corresponding to the N pole are arranged so as to straddle. The fourth sides 19L4 and 219L4 facing the second sides 19L2 and 219L2 are the second magnetic poles corresponding to the N poles of the first pair of magnets corresponding to the sensor magnets 22a and 22b and the second magnetic poles corresponding to the sensor magnets 23a and 23b. The magnet is arranged so as to straddle between the second magnetic poles corresponding to the N poles of the pair of magnets. The third sides 19L3 and 219L3 are linear, and the fourth sides 19L4 and 219L4 are concave or convex so as to intersect the third sides 19L3 and 219L3. As a result, the movable image pickup device 12 in the image blur correction function can be stably attracted in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

Further, a plurality of connecting members corresponding to the ball members 31a, 31b, 31c, the drive coils 15, 16, 17 and a plurality of actuators corresponding to the drive magnets 25a and 25b, 27a and 26b, 27a and 27b, and the magnetic displacement detection sensor 14a. , 14b and 14c, and a plurality of pairs of magnets corresponding to the sensor magnets 22a, 22b, 23a and 23b, respectively, may be provided in three or more. As a result, this makes it possible to stably attract the movable image sensor 12 in the image blur correction function in the optical axis AX direction. Therefore, the control of the image blur correction drive actuator becomes easy. Therefore, higher-performance image blur correction can be performed.

The image pickup apparatus corresponding to the digital camera 100 of the present embodiment may include the image blur correction apparatus 1 and the image pickup element 12 that converts an optical image of a subject into an electric signal. Further, the movable frame 11 may hold the image sensor 12 so as to be displaceable along the facing surface of the movable frame 11. This makes it possible to provide an image pickup apparatus having a higher-performance image blur correction function.

An image pickup apparatus corresponding to the digital camera 100 may include the image blur correction apparatus 1 and a plurality of optical systems that collect light from a subject. The movable frame 11 may hold one of the plurality of optical systems so as to be displaceable along the facing surface of the movable frame 11. This makes it possible to provide an image pickup apparatus having a higher-performance image blur correction function.

As described above, the first embodiment has been described as an example of the technique according to the present disclosure. However, the technique in the present disclosure is not limited to this, and can be applied to the embodiment in which the change, replacement, addition, omission, etc. are performed.

(Other embodiments)
Hereinafter, another embodiment will be illustrated.

[1]
The shapes of variant suction plates 19 and 219 in the first embodiment are not limited to arc shapes. Similar effects can be obtained if the deformable suction plates 19, 219 are concave or convex in the direction in which the restoring force of the deformed suction plates 19, 219 acts.

FIG. 10A is a diagram showing a modified suction plate according to another embodiment of the present disclosure. FIG. 10B is a diagram showing another variant suction plate according to another embodiment of the present disclosure. FIG. 10C is a diagram showing yet another modified suction plate according to another embodiment of the present disclosure. The shape of the variant suction plates 19 and 219 is, for example, the irregular suction plate 319 shown in FIG. 10A, the variant suction plate 419 shown in FIG. 10B, and the variant suction plate 519 shown in FIG. 10C. It may have a shape.

[2]
In the first embodiment, the image sensor driving type image blur correction device has been described as an example, but the image blur correction device according to the present disclosure is also applicable to the lens shift system. For example, a plurality of irregular suction plates are fixed on the peripheral surface of a donut-shaped lens frame (movable frame) that holds the image blur correction lens in the center, and a sensor magnet is installed at the position of the opposing donut-shaped fixed frame. To do. Even in such an image blur correction device, when the movable frame is displaced with respect to the fixed frame in the direction orthogonal to the optical axis, the force of the movable frame can be suppressed by the action of the deformed suction plate. As a result, stable image blur correction can be executed.

[3]
In the examples shown in FIGS. 8A to 8C and FIGS. 9A to 9C, the displacements of the deformed suction plates 19 and 219 in the X direction are taken as an example, but the displacements in the Y direction are also applicable. In this case, the deformed suction plates 19 and 219 and the sensor magnets 22a, 22b, 23a, and 23b in the X direction shown in FIGS. 8A to 8C and 9A to 9C may be arranged in the Y direction.

[4]
The sensor magnets facing the deformed suction plates 19, 219 may be a pair of sensor magnets. In this case, the pair of sensor magnets has a south pole and a north pole. The deformed attraction plates 19 and 219 have flat surfaces facing the pair of sensor magnets. Of the four sides forming the plane, the linear first side, the opposing third side, or both the first side and the third side are arranged across the S pole and the N pole. The concave or convex second side intersecting the first side, or the opposing fourth side, or both the second side and the fourth side are arranged along the N pole or the S pole. The deformed attraction plates 19 and 219 are arranged such that the centers thereof are arranged at the midpoints of the pair of magnets along the optical axis.

Also with the above configuration, the same effect as that of the first embodiment can be obtained.

[5]
In the first embodiment, the sensor magnets 22a, 22b, 23a, 23b, 24a, 24b are arranged on the fixed holding member 21, but they may be arranged on the movable frame 11. In this case, at least the corresponding magnetic displacement detection sensors 14 a, 14 b, 14 c and the variant suction plates 19, 219 are arranged on the fixed holding member 21.

[6]
As an example of the digital camera, the digital camera 100 shown in FIGS. 1 and 2 has been described, but the digital camera is not limited to this. Any camera system that can be equipped with the image blur correction device according to either the sensor shift system or the lens shift system may be used.

[7]
The actuator may be realized using a piezoelectric actuator.

The displacement detection mechanism may be realized by an angular velocity sensor or the like.

As described above, in the present embodiment, the second side may have an arc shape, a triangle shape, or a trapezoid shape. This facilitates control of the image blur correction drive actuator. Therefore, higher-performance image blur correction can be executed.

According to the present disclosure, it is possible to provide an image pickup apparatus having a higher-performance image blur correction function.

DESCRIPTION OF SYMBOLS 1 Image blur correction device 10 Housing 11 Movable frame 12 Image sensor 13 Circuit board 14a, 14b, 14c Magnetic displacement detection sensor 15 Drive coil 16 Drive coil 17 Drive coil 18 Holding member 19 Deformed suction plate 20 Body mount 20a Opening 21 Fixed Holding member 21a, 21b Limiting hole 21c Hole 22a, 22b Sensor magnet 23a, 23b Sensor magnet 24a, 24b Sensor magnet 25a, 25b Drive magnet 26b Drive magnet 27a, 27b Drive magnet 28a, 28b, 28c Fixed metal plate 29 Sensor magnet yoke Plate 30 Shutter Buttons 31a, 31b, 31c Ball Member 40 Hot Shoe 50 Flash Emitting Section 60 Electronic Viewfinder 70 Display Device 100 Digital Camera 101 Camera Body 110a, 110b, 110c Ball Holding Section 111a, 111b, 111c Movable Metal Plate 112 Restricted Axis 112a Buffer ring 113 Restriction shaft 113a Buffer ring 200 Lens unit 201 Lens mount 202 Focus ring 203 Zoom ring 219 Variant suction plate 319 Variant suction plate 419 Variant suction plate 519 Variant suction plate AX Optical axis S1 Front surface S2 Top surface S3 Rear surface S4 Bottom surface

Claims (14)

An image blur correction device for correcting the blur of a subject image to be captured, comprising:
A movable frame that can be displaced along a plane orthogonal to the optical axis,
A fixed frame facing the movable frame;
A plurality of connecting members that connect the fixed frame and the movable frame and support the movable frame in a displaceable manner;
A plurality of actuators that change the position of the movable frame according to the displacement of the movable frame;
A pair of magnets provided on one of the fixed frame and the movable frame and having a first magnetic pole and a second magnetic pole;
A magnetic body which is provided on the other of the fixed frame and the movable frame and is arranged so as to face the pair of magnets,
The magnetic body has a flat surface facing the pair of magnets, and the flat surface has four sides,
The first side of the four sides is disposed between the first magnetic pole and the second magnetic pole of the pair of magnets,
A second side intersecting the first side is disposed along one of the first magnetic pole and the second magnetic pole of the pair of magnets,
The first side is linear, the second side is concave or convex intersecting with the first side,
The plurality of connecting members are provided three or more,
The image blur correction device, wherein the magnetic body is arranged in a region obtained by a line segment connecting the respective connecting members of the plurality of connecting members. A plurality of pairs of magnets including the pair of magnets, each having a first magnetic pole and a second magnetic pole;
A plurality of displacement detection units provided on the other of the fixed frame and the movable frame so as to face the plurality of pairs of magnets, and detecting a displacement of the movable frame by a change in magnetic flux of the plurality of pairs of magnets. The image blur correction device according to claim 1. The movable frame, the displacement detector, the magnetic body, and the pair of magnets are arranged in this order along the optical axis direction,
The image blur correction device according to claim 2. The magnetic body is arranged to press the movable frame against the connecting member by being attracted by the pair of magnets.
The image blur correction device according to claim 1. The magnetic body is arranged such that the center of the plane of the magnetic body is aligned with the midpoint of the pair of magnets along the optical axis when the movable frame is not displaced. The image blur correction device described. The magnetic body further has a third side of the four sides facing the first side, the third side being disposed between the first magnetic pole and the second magnetic pole of the pair of magnets and facing the second side. The four sides are arranged along the other of the first magnetic pole and the second magnetic pole of the pair of magnets, the third side has a linear shape, and the fourth side has a concave shape or a convex shape that intersects with the third side. The image blur correction device according to claim 1, wherein The displacement detector detects a displacement amount and a displacement direction of the movable frame, and the actuator changes a position of the movable frame according to the detected displacement amount and a displacement direction of the movable frame. The image shake correction apparatus according to item 1. The image blur correction device according to claim 1, wherein the second side has an arc shape, a triangle shape, or a trapezoid shape. The image blur correction device according to claim 1, wherein a planar shape of the magnetic body is line-symmetric. An image blur correction device for correcting the blur of a subject image to be captured, comprising:
A movable frame that can be displaced along a plane orthogonal to the optical axis,
A fixed frame facing the movable frame, connecting the fixed frame and the movable frame,
A plurality of connecting members for movably supporting the movable frame,
A plurality of actuators that change the position of the movable frame according to the displacement of the movable frame;
A pair of magnets provided on one of the fixed frame and the movable frame and having a first magnetic pole and a second magnetic pole;
A magnetic body which is provided on the other of the fixed frame and the movable frame and is arranged so as to face the pair of magnets,
The pair of magnets includes a first pair of magnets and a second pair of magnets,
The magnetic body has a flat surface facing the first pair of magnets and the second pair of magnets, and the flat surface has four sides,
A first side of the four sides is disposed across the first magnetic pole and the second magnetic pole of the first pair of magnets,
A second side intersecting with the first side is disposed across the first magnetic pole of the first pair of magnets and the first magnetic pole of the second pair of magnets,
The first side is linear, the second side is concave or convex intersecting the first side,
The plurality of connecting members are provided three or more,
An image blur correction device, wherein the magnetic body is arranged in a region obtained by a line segment connecting the respective connecting members of the plurality of connecting members. The magnetic body is further
A third side of the four sides that faces the first side is disposed so as to straddle between the first magnetic pole and the second magnetic pole of the second pair of magnets,
A fourth side opposite to the second side is disposed across the second magnetic pole of the first pair of magnets and the second magnetic pole of the second pair of magnets,
The image shake correction apparatus according to claim 10, wherein the third side is linear, and the fourth side is concave or convex that intersects the third side. The image blur correction device according to claim 2, wherein the plurality of actuators, the plurality of displacement detection units, and the plurality of pairs of magnets are respectively provided in three or more. An image blur correction device according to claim 1, an image sensor for converting an optical image of the subject into an electric signal,
The image pickup device, wherein the movable frame holds the image pickup element so as to be displaceable along a facing surface of the movable frame. An image blur correction device according to claim 1, and a plurality of optical systems that collect light from the subject,
The image pickup device, wherein the movable frame holds one of the plurality of optical systems so as to be displaceable along a facing surface of the movable frame.

Images